Quordle is four Wordles at once, sharing nine guesses. Type each guess once into the tiles at the top -- it applies to all four boards -- then click that guess's tiles on each board below to mark the colors that board gave it. Click Filter word lists and each board gets its own list of five-letter words from WORD.LST that still fit.
Gray = letter's not in that board's word (or not more than what's already green/yellow elsewhere in that row) · Yellow = in the word, wrong spot · Green = correct spot. A board that comes back all green is marked solved and drops out of the suggestions.